Free Online Audio Converter

Convert WAV, MP3, M4A and AAC files to MP3 or WAV right in your browser. Add up to 20 files, pick the quality and download the results. Nothing is uploaded.

Convert WAV, MP3, M4A and AAC Online

One converter for the formats you meet every day: WAV from recorders and audio editors, MP3 for sharing, M4A from iPhone voice memos and AAC from apps and screen recorders. It opens any of them and turns it into an MP3 or a WAV.

Convert Audio Without Uploading

The conversion runs on your own device, so your recordings never leave it. That makes it fast for large files and safe for private interviews, demos and voice notes. It works in current browsers on Windows, Mac, Chromebook, iPhone, iPad and Android.

Convert Many Files at Once

Add up to 20 files in one go, even in different formats. They are converted one after another, each gets its own player and download button, and Download All saves them together. The sample rate and the channels of each file are kept.

What This Converter Does Not Do

It creates MP3 and WAV files only. Browsers cannot reliably encode M4A or AAC, so converting to those formats is not offered. MP3 plays on practically every device and app, which is usually what you need when a file has to be shared.

How to Convert Audio in 3 Steps

Step 1

Add Your Files

Choose WAV, MP3, M4A, AAC or FLAC files, or drag them onto the box.

Step 2

Choose Format and Quality

Pick MP3 with a bitrate, or WAV with a bit depth.

Step 3

Convert and Download

Click Convert Files, then download each file or all of them at once.

Select Audio Files

Drag and drop WAV, MP3, M4A, AAC or FLAC files here or choose them from your device; you can add up to 20 at once.

Files

No files yet. Add one or more files to convert them.

The sample rate and the channels of each file are kept. Files with more than two channels are mixed down to stereo.

Each button sets the right output format and takes you to the converter.

WAV to MP3

A WAV file takes about 10 MB per minute; an MP3 at 192 kbps needs about 1.4 MB. Convert to MP3 when a recording has to be emailed, uploaded to a podcast host or played on a phone. Keep the WAV as your master copy, because MP3 removes detail that cannot be restored.

Convert WAV to MP3

MP3 to WAV

Some video editors, DJ programs and samplers only accept WAV or work more reliably with it. Converting an MP3 to WAV does not bring back detail the MP3 has lost, but it stops further loss when the file is edited and saved again. 16-bit is the usual choice.

Convert MP3 to WAV

M4A to MP3

M4A is the format of iPhone voice memos and many Apple apps. As an MP3, the same recording plays in Windows programs, on Android phones and on older car stereos without extra apps. For speech, 128 kbps is plenty.

Convert M4A to MP3

M4A to WAV

Convert a voice memo or an interview to WAV when your audio editor or transcription program does not open M4A. The file gets larger, but every program can read it.

Convert M4A to WAV

AAC to MP3

Files ending in .aac often come from screen recorders and messaging or streaming apps. MP3 is supported by more devices and programs. At the same bitrate MP3 is slightly less efficient than AAC, so choose 192 kbps or more for music.

Convert AAC to MP3

AAC to WAV

Convert AAC to WAV when an editor, sampler or broadcast system needs uncompressed audio. The sound stays exactly as good as the AAC, and the file no longer has to be decoded each time it is opened.

Convert AAC to WAV

WAV, MP3, M4A and AAC Compared

FormatTypeSize per minute (stereo)Best for
WAVUncompressedAbout 10 MB (16-bit, 44.1 kHz)Recording, editing and master copies
MP3LossyAbout 1.4 MB at 192 kbpsSharing; plays on almost any device
M4ALossy (AAC inside an MP4 container)About 1 MB at 128 kbpsiPhone recordings and Apple apps
AACLossy (raw AAC stream)Similar to M4AApps, streams and screen recorders

A WAV is only as good as its source: converting an MP3 or M4A to WAV makes the file larger, not better.

Related Tools and Guides

Sample Rate Converter LUFS & Peak Analyzer
WAV vs. FLAC vs. MP3: Lossless Audio Formats

Frequently Asked Questions

Which formats can I convert?
You can open WAV, MP3, M4A, AAC and FLAC files and convert them to MP3 or WAV.

Does converting WAV to MP3 lose quality?
Yes, a little. MP3 is lossy, so some detail is removed. At 192 kbps or higher the difference is hard to hear in normal listening. Keep the original WAV if you may need full quality later.

Which MP3 bitrate should I choose?
192 kbps is a good default for music. Use 128 kbps for speech and podcasts when small files matter, and 256 or 320 kbps when quality matters more than size.